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Audio Converters Forum
[TLV320AIC33] Line-in protection
I have a question about the use of the line inputs of the TLV320AIC33 audio codec. The problem is that in my application the Line1L input isn't working anymore.
I have an audio source connected to the Line1L input with a long cable (1-2 meter). The audio source is most of the time switched off. And this means that the audio output of the device is in high impedance state. So, the 1-2 meter cable is floating.Furthermore the Line1L input is enabled on demand only. So, most of the time the Line1L input is also disabled.
Now, the question is: Is it possible to destroy the Line1L input if the input isn't enabled and the 1-2 meter cable is attached to that input pin (decoupled with a 100nF capacitor like in the application notes)?!
Although not particularly sensitive, all of the inputs that a user can access should be protected against ESD. The maximum voltage permissible is shown in the "Absolute Maximum Ratings" section at the front of the data sheet. This applies even if the inputs are not selected. The decoupling caps will block dc and allow for the proper dc biasing but will not help with fast slewing transient voltages.
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